CHEMISTRY 2021 UTME PAST QUESTION
1. Which of the following equations is not feasible as written?
A. 2NaOH + Cl
2
→ NaCl + NaClO + H
2
O
B. 2Fe + 3Cl
2
→ 2FeCl
3
C. 4P + 5O
3
→ 2P
2
O
5
D. Fe + Cl
2
→ FeC
12
2. Which of this following can be used in making perfumes?
A. Ethylethanoate
B. Ethanol
C. Benzene
D. Ethanoic acid
3. In ammonia molecule, the number of non-bonding electron(s) is/are
A. 4
B. 2
C. 3
D. 1
4. How many moles of the acid are present in 200 cm3 of 1.5 moldm-3 HCl?
A. 0.45 moles
B. 0.6 moles
C. 0.3 moles
D. 0.7 moles
5. Latex is a polymer of
A. Isoprene
B. Ethane chloride
C. Styrene
D. Terylene
6. The use of hydrogen gas to fill balloons for both meteorological and other scientific pur[poses is limited by its
A. Lightness
B. Inertness
C. Monovalency
D. Inflammability
7. If 93cm3 of SO2 diffuses through a porous partition in 14s, how long will it take the same volume of H2S to diffuse through the same partition, under the same conditions?
A. 7.4s
B. 3.8s
C. 26.3s
D. 9.1s
8. Brass is an alloy of copper and
A. Zinc
B. Tin
C. Carbon
D. Sulphur
9. Name the compound below
A. 4,4, dimethylpentane
B. 2,2,4 – trimethylbutane
C. 2,2 – dimethylpentane
D. 1,3,3 – trimethylbutane
10. The flame used in welding and cutting of metals is?
A. Oxy - ethane flame
B. Oxygen flame
C. Hydrogen flame
D. Oxy – acetylene flame
11. Which of the following decolorizes acidified KMnO
4
?
A. Butane
B. Ethane
C. Ethane
D. Propane
12. What mass of aluminium is deposited when 15A of current is used to electrolyze its molten form for 2hrs, 30mins?
A. 13g
B. 17g
C. 22g
D. 14g
13. Rain water is considered as a mixture because?
A. It contains less amount of oxygen
B. It contains particles of dust and other substances
C. It forms lather readily with soap
D. Of its colour
14. In the preparation of which of the following gases is kips apparatus used?
A. O
2
B. H
2
C. H
2
S
D. N
2
15. Ethanol is used in ¬¬______ industry
A. Laundry
B. Bottling
C. Brewing
D. Tanning
16. The resulting solution when water reacts with chlorine contains?
A. HCl & HOCl
B. HCl
C. HOCl
D. H2 & HCl
17. The alloy of aluminium used in the construction of aircraft is?
A. Duralumin
B. Alnico
C. Soft solder
D. Bronze
18. How many coulombs of electricity will be required to deposit 6.11g of silver from a solution of silver salt? [Ag =108, IF =96,500C].
A. 5,459.4C
B. 1,819.5C
C. 2,729.7C
D. 10,918.8C
19. What volume of which gas will be left unused when 100 cm
3
of hydrogen and 40cm
3
of oxygen are mixed and sparked in a combustion chamber?
A. 10cm
3
of O
2
B. 20cm
3
of O
2
C. 10cm
3
of H
2
D. 20cm
3
of H
2
20. An alcohol which does not have the hydroxyl group bounded to the first carbon atom can be classified as?
A. Primary
B. Primary and secondary
C. Secondary and tertiary
D. Tertiary
21. What is the colour of phenolphthalein in an acidic solution?
A. Colourless
B. Pink
C. Red
D. Blue
22. In the process of silver – plating metal X
A. Silver is the anode while X is the cathode and direct current is used
B. Silver is the cathode while X is the anode and alternating current is used
C. Silver is the anode while X is the cathode and alternating current is used
D. Silver is the cathode and X is the anode and direct current is used
23. Which of the following has zero fold degeneracy?
A. p
B. s
C. d
D. f
24. 45g of Pb(NO
3
)
2
is required to saturate 25cm
3
of distilled water at 20
o
C. Determine the solubility of the salt at this temperature.
A. HCl
B. SO
2
C. CO
2
D. NO
2
25. With which of the following does ammonia react to produce a dense white fume?
A. HCl
B. SO
2
C. CO
2
D. NO
2
26. In a given homologous series, successive member differ in their relative molecular mass by?
A. 13
B. 14
C. 26
D. 28
27. The gas that is used for the treatment of cancer is?
A. Argon
B. Neon
C. Radon
D. Xenon
28. Entropy increases in which of the following orders?
A. Solid → Liquid → Gas
B. Gas → Liquid → Solid
C. Liquid → Gas → Solid
D. Solid → Gas → Liquid
29. An example of an acidic oxide is?
A. N
2
O
B. NO
C. CuO
D. SO
2
30. The petroleum fraction that is used in heating furnaces is?
A. Petrol
B. Kerosene
C. Diesel
D. Lubrication oil
31. The process by which starch is converted to ethanol is ?
A. Distillation
B. Hydration
C. Dehydration
D. Fermentation
32. The radioactive emission with the least ionization power is?
A. X – rays
B. Alpha particles
C. Beta particles
D. Gamma rays
33. How many hydrogen ions ate present in 500cm
3
of 0.5moldm
-3
of H
2
SO
4
?
A. 3.01x10
23
B. 1.505x10
23
C. 7.525 x10
22
D. 7.525 x10
23
34. What is the oxidation number of chromium in K
2
Cr
2
O
7
?
A. +1
B. +2
C. +3
D. +6
35. The maximum number of electrons that the N shell can accommodate is
A. 8
B. 18
C. 32
D. 50
36. What volume of CO2 will be produced at STP when 33.6g of sodium hydrogen trioxocarbonate (IV) is subjected to thermal decomposition?
A. 4.48dm
3
B. 2,24dm
3
C. 1.12dm
3
D. 0.56dm
3
37. A catalysis speeds up the rate of a chemical reaction by?
A. Taking part in the reaction
B. Polymerizing
C. Increasing the activation energy
D. Lowering the activation energy
38. Which of the following gases is collected by upward displacement of air?
A. H
2
B. Cl
2
C. NH
3
D. None
39. An alkanol which is trihydric is
A. Glycol
B. Ethanol
C. Glycerol
D. Propanol
40. The most dangerous gaseous pollutant is?
A. CO
2
B. CO
C. NH
3
D. H
2
S
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